Meteoritical Bulletin: Entry for Northwest Africa 12832

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Northwest Africa 12832

Basic information

Name: Northwest Africa 12832
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12832
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 997 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	CO3
Recommended:			CO3 [explanation]

This is 1 of 642 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 11 Oct 2019

Writeup

Writeup from MB 108:

Northwest Africa 12832 (NWA 12832)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CO3)

History: Purchased in 2018 by Mbark Arjdal from a dealer in Zouerat, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Small well-formed chondrules (apparent diameter 170 ± 100 µm, N = 20), mineral fragments and fine grained CAI are set in a much finer grained matrix (red-brown in thin section, ~40 vol.%).

Geochemistry: Olivine (Fa_24.0±24.6(range Fa_0.7-52.3), N = 4; Cr₂O₃ in ferroan examples 0.13-0.33 wt.%, mean 0.23 wt.%, N = 2), low-Ca pyroxene (Fs_6.0±5.5Wo_1.1±0.4(range Fs_5.1-11.8Wo_0.8-1.6), N = 3), augite (Fs_7.3±2.7Wo_36.4±0.3(range Fs_5.4-9.2Wo_36.2-36.6), N = 2), diopside (Fs_1.1Wo_38.3), anorthite (An_99.0Or_0.0).

Classification: Carbonaceous chondrite (CO3).

Specimens: 23.8 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Zouerat
Date:	P 2018
Mass (g):	997
Pieces:	4
Class:	CO3
Shock stage:	S2
Weathering grade:	moderate
Fayalite (mol%):	24.0±24.6
Ferrosilite (mol%):	6.0±5.5
Wollastonite (mol%):	1.1±0.4
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	23.8
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj Z19; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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